The Chadar trek on Ladakh's Zanskar River has been postponed from its January 10 start due to insufficient ice formation, disappointing trekkers. Officials are assessing the route, with a potential new start date around January 15, and plan to deploy additional NDRF personnel for safety. Concerns about incomplete freezing, attributed to climate change, have impacted the trek in recent years, with last year's trek starting on January 13.